Harianingsih, Harianingsih (2023) The Effect of Air Injection Flow Rate towards The Formation of Radicals in Liquid Glow Discharge Plasma Electrolysis with K2SO4 Solution. Reaktor, 23 (2). pp. 37-43. ISSN 0852 – 0798

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Abstract

Glow discharge is a part of plasma formation phenomenon which occurs on the electrode side in contact with the electrolyte solution, started with an electrolysis reaction with direct electric current. In this research, 0.02 M K2SO4 electrolyte, tungsten anode and stainless-steel cathode was used in a direct current plasma electrolysis reactor. The plasma formation is demonstrated by a strong current and voltage characteristic curve. In the first stage, characterization was carried out in the form of current and voltage strength measurement at various air-injected flow rates in order to obtain the position of the glow discharge zone. In the second stage, measurement of the emission intensity of radicals was carried out to identify the radicals formed and in the third stage, the nitrate produced was measured. There are three plasma formation zones: the ohmic zone, the transition zone and the glow discharge plasma zone. Air injection affects the formation of glow discharge plasma and radicals. In this study, emission intensity measurements were carried out to determine the radicals that contribute to the formation of nitrate in nitrogen fixation using plasma electrolysis. Without the injection of air, radicals formed only •OH, •H, and •O with emission intensities of 20012 a.u, 10121 a.u and 10245 a.u. air injection of 0.8 L.min-1 produced radicals •OH, •N, •N2*, •N2+, •H and •O with emission intensities of 30863a.u, 20139 a.u, 28540 a.u, 18023 a.u, 12547 a.u and 49800 a.u, respectively. Many radicals are generated when the plasma reaches its stability. In addition, at 0 L.min-1, 0.2 L.min-1, 0.4 L.min-1 and 0.8 L.min-1 stable plasma were formed at 675 V, 660 V, 650 V and 650 V. It is concluded that the injection of air accelerates the formation of a gas envelope to reduce energy.

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